Bug fixes

• rlwrap would mess up history when compiled with readline-8.3
• --filter 'filter_commandline $with <shell_matachars' would not find filters in $RLWRAP_FILTERDIR
• rlwrap would not always honour show-mode-in-prompt
• make pipeline filter find filters in $RLWRAP_FILTERDIR

New features

• allow full user control of word-breakers with --break-chars='precisely:...'
• simplify handling of --prompt-colour, which now accepts general (ANSI) color codes for e.g. 256-color terminals
• add -i option to filters logger and logger.py (making them useful stand-alone)
• add example filter null2.py (to show how to make argparse print filter help with e.g. rlwrap -z null2.py)